feat: add slides generation tool with multiple slide types

- Add slides.tool.ts with support for title, bullets, chart, stats, table, cards, timeline, quote, comparison, equation, image, summary slide types
- Chart types: bar, horizontal-bar, line, donut, radar
- Integrate with agent executor and canvas system
- Add multilingual support (en/fr)
- Various UI improvements and bug fixes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

memento-note/app/api/brainstorm/route.ts

@@ -109,6 +109,16 @@ Respond ONLY with a valid JSON array of objects:
   }
 }
 
+function localeToLanguageName(locale?: string): string {
+  const map: Record<string, string> = {
+    en: 'English', fr: 'French', es: 'Spanish', de: 'German',
+    it: 'Italian', pt: 'Portuguese', nl: 'Dutch', ru: 'Russian',
+    zh: 'Chinese', ja: 'Japanese', ko: 'Korean', ar: 'Arabic',
+    fa: 'Farsi', hi: 'Hindi', pl: 'Polish',
+  }
+  return map[locale ?? ''] ?? 'English'
+}
+
 function buildPromptV2(seedIdea: string, classifiedNotes: ClassifiedNote[], locale?: string): string {
   const supportNotes = classifiedNotes.filter(n => n.category === 'SUPPORT')
   const tensionNotes = classifiedNotes.filter(n => n.category === 'TENSION')
@@ -168,7 +178,7 @@ RESPOND ONLY with a valid JSON array of 9 objects:
 
   CRITICAL: Each idea MUST have at least 1 noteRef. Only use null noteId if genuinely no note connects to that idea.
 
-LANGUAGE: You MUST write ALL titles, descriptions, connectionToSeed, and explanation fields in ${locale === 'fr' ? 'French' : locale === 'es' ? 'Spanish' : locale === 'de' ? 'German' : locale === 'it' ? 'Italian' : locale === 'pt' ? 'Portuguese' : locale === 'nl' ? 'Dutch' : locale === 'ru' ? 'Russian' : locale === 'zh' ? 'Chinese' : locale === 'ja' ? 'Japanese' : locale === 'ko' ? 'Korean' : locale === 'ar' ? 'Arabic' : locale === 'fa' ? 'Farsi' : locale === 'hi' ? 'Hindi' : locale === 'pl' ? 'Polish' : 'the same language as the seed idea'}.`
+LANGUAGE: You MUST write ALL titles, descriptions, connectionToSeed, and explanation fields in ${localeToLanguageName(locale)}.`
 }
 
 function buildFallbackIdeas(classifiedNotes: ClassifiedNote[]): any[] {